/*!
    \file  gd32vf103_wwdgt.h
    \brief definitions for the WWDGT
    
    \version 2019-6-5, V1.0.0, firmware for GD32VF103
*/

/*
    Copyright (c) 2019, GigaDevice Semiconductor Inc.

    Redistribution and use in source and binary forms, with or without modification, 
are permitted provided that the following conditions are met:

    1. Redistributions of source code must retain the above copyright notice, this 
       list of conditions and the following disclaimer.
    2. Redistributions in binary form must reproduce the above copyright notice, 
       this list of conditions and the following disclaimer in the documentation 
       and/or other materials provided with the distribution.
    3. Neither the name of the copyright holder nor the names of its contributors 
       may be used to endorse or promote products derived from this software without 
       specific prior written permission.

    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 
IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 
INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 
NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 
WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY 
OF SUCH DAMAGE.
*/

#ifndef GD32VF103_WWDGT_H
#define GD32VF103_WWDGT_H

#include "gd32vf103.h"
#include "gd32vf103_rcu.h"
#include "gd32vf103_dbg.h"

/* WWDGT definitions */
#define WWDGT                       WWDGT_BASE                                /*!< WWDGT base address */

/* registers definitions */
#define WWDGT_CTL                   REG32((WWDGT) + 0x00000000U)              /*!< WWDGT control register */
#define WWDGT_CFG                   REG32((WWDGT) + 0x00000004U)              /*!< WWDGT configuration register */
#define WWDGT_STAT                  REG32((WWDGT) + 0x00000008U)              /*!< WWDGT status register */

/* bits definitions */
/* WWDGT_CTL */
#define WWDGT_CTL_CNT               BITS(0,6)                                 /*!< WWDGT counter value */
#define WWDGT_CTL_WDGTEN            BIT(7)                                    /*!< WWDGT counter enable */

/* WWDGT_CFG */
#define WWDGT_CFG_WIN               BITS(0,6)                                 /*!< WWDGT counter window value */
#define WWDGT_CFG_PSC               BITS(7,8)                                 /*!< WWDGT prescaler divider value */
#define WWDGT_CFG_EWIE              BIT(9)                                    /*!< early wakeup interrupt enable */

/* WWDGT_STAT */
#define WWDGT_STAT_EWIF             BIT(0)                                    /*!< early wakeup interrupt flag */

/* constants definitions */
#define CFG_PSC(regval)             (BITS(7,8) & ((uint32_t)(regval) << 7))   /*!< write value to WWDGT_CFG_PSC bit field */
#define WWDGT_CFG_PSC_DIV1          CFG_PSC(0)                                /*!< the time base of WWDGT = (PCLK1/4096)/1 */
#define WWDGT_CFG_PSC_DIV2          CFG_PSC(1)                                /*!< the time base of WWDGT = (PCLK1/4096)/2 */
#define WWDGT_CFG_PSC_DIV4          CFG_PSC(2)                                /*!< the time base of WWDGT = (PCLK1/4096)/4 */
#define WWDGT_CFG_PSC_DIV8          CFG_PSC(3)                                /*!< the time base of WWDGT = (PCLK1/4096)/8 */

/* function declarations */
/* reset the window watchdog timer configuration */
void wwdgt_deinit(void);
/* start the window watchdog timer counter */
void wwdgt_enable(void);

/* configure the window watchdog timer counter value */
void wwdgt_counter_update(uint16_t counter_value);
/* configure counter value, window value, and prescaler divider value */
void wwdgt_config(uint16_t counter, uint16_t window, uint32_t prescaler);

/* enable early wakeup interrupt of WWDGT */
void wwdgt_interrupt_enable(void);
/* check early wakeup interrupt state of WWDGT */
FlagStatus wwdgt_flag_get(void);
/* clear early wakeup interrupt state of WWDGT */
void wwdgt_flag_clear(void);

#endif /* GD32VF103_WWDGT_H */
